How dare you test a private method

I feel inspired to talk more about “testing a private method” (gasp!). Since people seem to get upset about it.Where did this idea of it being bad even come from? I remember when learning to code it was all over the place. Blog posts, books, podcasts.I remember being asked it as a trick question in interviews: "which code should you test?". Then the interviewer would nod as soon as I'd say "the public methods, never private!", to signal we have read the same blog posts.